Question:
A carbonyl compound X(C$_5$H$_8$O) gives yellow precipitate with NaOI. Hemiacetal of X with methanol/dry HCl is:
A carbonyl compound X(C$_5$H$_8$O) gives yellow precipitate with NaOI. Hemiacetal of X with methanol/dry HCl is:
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A compound giving yellow ppt with NaOI has CH$_3$CO– group and forms hemiacetals with alcohols.
Updated On: Jun 4, 2025
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The Correct Option is C
Solution and Explanation
Positive iodoform test (yellow ppt with NaOI) indicates presence of CH$_3$CO– group.
Hemiacetal formation with CH$_3$OH gives a structure having both –OH and –OCH$_3$ on same carbon.
Only structure (3) matches CH$_3$–C(OH)(OCH$_3$)–C$_6$H$_5$.
Hemiacetal formation with CH$_3$OH gives a structure having both –OH and –OCH$_3$ on same carbon.
Only structure (3) matches CH$_3$–C(OH)(OCH$_3$)–C$_6$H$_5$.
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